Surprisingly no one mentioned that these Battery Packs can weigh a LOT and when mounting to a "wall" you need something really serious to be able to hold them up there... Nor is there any mention of "backing" because I hate to say it, Drywall will not cut it. Depending on your region, the inspectors etc, most will want to see either concrete wall, Fireboard or Magnesium Oxide sheets (similar to cement board but cheaper & better - hard to get).
Racks & Shelves can solve those issues obviously. There are also a few Gotcha's lurking there too... OP is in Upsate NY so a region that knows Cold ! When placing packs on a rack/shelf be aware that Temps are always lower at Ground Level and that even 1 degree Celsius difference can affect the charge/discharge rates of battery packs... YES, even 1 flippin celsius ! This is rarely a problem between 20C/68F to 30C/86F but outside of that temp zone this WILL be affected. The packs closest to ground level will always be cooler and as such will be a bit slower to charge & discharge.
We have people here chasing after WHY their (identical) battery packs charge/discharge at different rates and even when they see the BATT Temps being reported they NEVER Equate it... Point it out to them and then get dumped on for it... Yet, being in the North & offgrid I have run several tests including hard & abusive Thrash tests to force system issues to know the edges (part of being Ex Mil and needing to know extreme cases) and this has been proven several times. As I have a separate Powerhouse that is independently heated I have total control over the environment in there and capable of doing tests that would not be normally possible inside a residence. (Well unless you really want to be uncomfortable).
Here is the Hard Truth about Lithium Based batteries.
They are ALL Affected by temps ! Even as little as 1 degree celsius.
They are ALL Millivolt & Milliamp sensitive. NOT Brute force like Lead Acid.
After a few years with a few different configurations, all of which were tested harshly, I came to realize for optimal performance of all packs concurrently, I built a shelf @ 36" height from floor (optimal location) and all packs are same temp. BTW: 6 packs - 45kWh.